Piston-packing



W. J. SCHLACKS.

PISTON PACKING. APPLICATION luzb AUG.8,1918.

Patented July 12, 11921.

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WILLIAM J. SOHLACKS, OF CHICAGO, ILLINOIS, ASSIGNOR TO MOCORD t (30M-PANY, OF CHICAGO, ILLINOIS, CORPORATION OF DELAWARE.

PISTON-PACKING.

nasaoaa.

Application filed August 8, 1918.

To all whom it may concern:

Be it known that I, WILLIAM J. SoHLAoKs, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented certain new and useful Improvements in Piston-Packing; and I dohereby declare the following to be a full, clear, and exact descriptionof the invention, such as will enable others skilled in the art to whichit appertains to make and use the same.

My invention relates to pumps employing reciprocating pistons and isdirected to the provision of an improved packing for rendering tight thejoint around the reciprocating piston.

Generally stated, the invention consists of the novel construction andcombination of parts hereinafter described and defined in the claims.

My invention provides means whereby the pressure on thepackingsurrounding the piston will increase and decrease with theincreasing pressure produced by the pump on the fluid dischargedtherefrom. Otherwise stated, I provide what may be designated as abalance piston packing. The invention is illustrated in the single viewof drawings which -is a vertical section showing a lubricator pump ofthe type used in certain locomotive lubricators.

This pump is shown for the purposes of illustration, and as shown,comprises a body casting 1 in which the customary plungeracting pumppiston 2 is arranged to reciprocate. The body 1 is formed in its lowerend with a ball chamber 1*, to which oil is admitted through a tube 3controlled by the action of check balls 4. From chamber 1 oil isdelivered through a hollow plug-like valve cage 5 and is dischargedunder the action of check ball 6; and from thence, oil passes outthrough delivery conduit 7 The particular valve structure shown is notclaimed in this application but is claimed in my co-pending application,S. N. 246,736,

filed July 25, 1918.

Pump plunger 2 reciprocates through a stuffing box chamber 8 formed inthe body 1 and through a packing nut 9 that is threaded into the upperend of chamber 8. The bottom of chamber 8 is made conical and the innerend of nut 9 is also made concavely conical. Suitable packings 10surround the piston or pump plunger 2, and snugly fit the Specificationof Letters Patent.

proper seating of the packings.

Patented July 12, rear.

Serial No. 248,976.

same and the interior chamber 8 and are formed with conical ends thatfit the conical portions of said seat 8 of the nut 9. A coiled spring 11is compressed between the two packings and surrounds the piston withinchamber 8. Preferably, metal washers 12 are placed around the pumpplunger or piston and are spring pressed against the inner ends of thetwo packings. fl by-passage 13 connects oil delivery conduit 7 to theinterior of the stufling box chamber 8. As already indicated, thepeculiar form of pump illustrated constitutes no part of the presentinvention.

The spring 11 is necessary to hold the packings against the bottom ofthe stufiing box and the bottom of the packing nut before the pump hasbegun pumping action at pressure. The pressure that the pump exertsafter the pumping action is established, drives the oil into chamber 8and causes the same to exert the same pressure on both packings, andthis, as is evident, causes proper seating from under the pressure thatvaries witlnjthe pumping pressure. The spring, however, ishighlyimportant to insure proper initial seating of the packings so that thepressure will always be rendered effective during the pumping action.

In the pumping action, any pressure that the pump exerts above the checkballs or valves of the pump (regardless of whether the plunger isarranged to work vertically or horizontally) acts to seat the packingsby exerting pressure between the same, so that at every pumping strokeof the plunger, movement of the packing with the plunger is resisted bythe pressure against which the pump is working, plus the tension of thespring, so that the packings are under minimum necessary pressure at alltimes. 'As the packings wear, the spring I automatically takes up play,and maintains the proper seating of the packings, and moreover, a littlemore oil enters the chamber to compensate for displacement and continuesthe tinues until the packings are. worn out so that a joint between theplungers and the packings and'between the packings and the charge checkvalves arranged therein, a pump piston chamber and a pressure chamberextending parallel thereto, spaced packing members disposed about saidpiston, the pressure chamber communicating with the space between saidmembers whereby said packing will be subjected to the pressure producedby the piston in the said pressure chamber.

2. In a high pressure pump structure, the combination with a pump casingequipped with intake and discharge check Valves, a

piston chamber, a piston therein, spaced packing members surroundingsaid piston, a

pressure chamber extending parallel to the essee? piston chamber andhaving an opening extending therefrom to the space between said packingmembers whereby said packing members will be subjected to the pressureproduced by the piston in the pressure chamber, and a spring acting onsaid packing members to keep the same initially seated, regardlessofcthe fluid pressure.

Intestimony whereof I affix my signature in presence of two witnesses.

' WILLIAM J. SCHLACKS.

Witnesses:

IRMA G. YOUNG, E. R. JOHNSON. 1

